Powershell to asynchronously refresh analysis server model in azure

RefreshAASModel.ps1

using namespace System.Net

# Input bindings are passed in via param block. 
param($Request, $TriggerMetadata)

# Init defaults
$status = [HttpStatusCode]::BadRequest
$ErrorActionPreference = "STOP"

$RequestBody = $Request.Body
if (!$RequestBody) {
	Push-OutputBinding -Name Response -Value ([HttpResponseContext]@{
            StatusCode = $status
            Body       = "Please pass a valid body in the request's body."
        })
}
else {
    # Retrieve AAS details from request body
    $AnalysisServerName = $RequestBody.AnalysisServerName
    $AnalysisServerLocation = $RequestBody.AnalysisServerLocation
    $ModelName = $RequestBody.ModelName
    $AASObject = $RequestBody.AASObject
    
    #check if AASObject is empty or not. Irrespective of documentation
    #We need Refresh Type for a call as mandatory param
    if (!$AASObject -or ($AASObject.Count -eq 0)) {
        $AASObject = @{
            'Type' = 'Full'
        }
    }

    Connect-AzAccount 

    try {
        
        $analysisServerResource = Get-AzAnalysisServicesServer -Name $AnalysisServerName
				
	Write-Output "Fetching access token to refresh the model"
	#fetch access token which will be used to refresh the models
	$Output = New-Object -TypeName hashtable
	Get-AccessToken -Output $Output #fetch access token using the PS here https://adamtheautomator.com/microsoft-graph-api-powershell/

	#request body to be sent to AAS REST API
	$jsonBody = $AASObject | ConvertTo-Json;
	Write-Output "The body of the REST API call to refresh the model is"
	Write-Output $jsonBody

	$uri = "https://$AnalysisServerLocation.asazure.windows.net/servers/$AnalysisServerName/models/$ModelName/refreshes"
	Write-Output "Invoking POST $uri"
	
	#$Output.AuthHeaders follows the following format
	#$Output.AuthHeaders = @{
        #'Content-Type'  = 'application/json'
        #'Authorization' = "Bearer " + access_token
    	#}
	$PostSplat = @{
		Method      = 'POST'
		Body        = $jsonBody
		Uri         = $uri
		Headers     = $Output.AuthHeaders
	}
	$results = Invoke-RestMethod @PostSplat

	Write-Output $results
	$status = [HttpStatusCode]::OK
	Push-OutputBinding -Name Response -Value ([HttpResponseContext]@{
    		StatusCode = $status
    		Body       = $results
	})
    }
    catch {
        Write-Output "Exception was thrown. Details below."
        $_
        Push-OutputBinding -Name Response -Value ([HttpResponseContext]@{
            StatusCode = $status
            Body       = $_
        })
    }
}